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NCP551SN33T1G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP551SN33T1G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 12 page NCP551, NCV551 www.onsemi.com 9 APPLICATIONS INFORMATION A typical application circuit for the NCP551 series is shown in Figure 20. Input Decoupling (C1) A 0.1 mF capacitor either ceramic or tantalum is recommended and should be connected close to the NCP551 package. Higher values and lower ESR will improve the overall line transient response. Output Decoupling (C2) The NCP551 is a stable Regulator and does not require any specific Equivalent Series Resistance (ESR) or a minimum output current. Capacitors exhibiting ESRs ranging from a few m W up to 3.0 W can thus safely be used. The minimum decoupling value is 0.1 mF and can be augmented to fulfill stringent load transient requirements. The regulator accepts ceramic chip capacitors as well as tantalum devices. Larger values improve noise rejection and load regulation transient response. Enable Operation The enable pin will turn on or off the regulator. These limits of threshold are covered in the electrical specification section of this data sheet. If the enable is not used then the pin should be connected to Vin. Hints Please be sure the Vin and GND lines are sufficiently wide. When the impedance of these lines is high, there is a chance to pick up noise or cause the regulator to malfunction. Set external components, especially the output capacitor, as close as possible to the circuit, and make leads as short as possible. Thermal As power across the NCP551 increases, it might become necessary to provide some thermal relief. The maximum power dissipation supported by the device is dependent upon board design and layout. Mounting pad configuration on the PCB, the board material, and also the ambient temperature effect the rate of temperature rise for the part. This is stating that when the NCP551 has good thermal conductivity through the PCB, the junction temperature will be relatively low with high power dissipation applications. The maximum dissipation the package can handle is given by: PD + TJ(max) * TA R qJA If junction temperature is not allowed above the maximum 125 °C, then the NCP551 can dissipate up to 400 mW @ 25 °C. The power dissipated by the NCP551 can be calculated from the following equation: Ptot + Vin *Ignd (Iout) ) [Vin * Vout] *Iout or VinMAX + Ptot ) Vout * Iout IGND ) Iout If a 150 mA output current is needed then the ground current from the data sheet is 4.0 mA. For an NCP551SN30T1 (3.0 V), the maximum input voltage will then be 5.6 V. Battery or Unregulated Voltage Figure 20. Typical Application Circuit Vout C1 C2 OFF ON + + 1 3 2 4 5 |
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